Problem 21 is: Write a function which returns the Nth element from a
sequence.
My solution is:
(fn [[f & r] n]
(if (zero? n)
f
(recur r (dec n)))))
but it is marked as incorrect. Opening a REPL, and defining it with defn:
(defn mynth
[[f & r] n]
(if (zero? n)
f
(recur r (dec n))))
user=> (mynth '(4 5 6 7 8) 2)
6
And using def + fn:
(def mynth-anon
(fn [[f & r] n]
(if (zero? n)
f
(recur r (dec n))))))
user=> #'user/mynth-anon
user=> (mynth-anon '(4 5 6 7 8) 2)
6
But (it id this result which I can't understand and the reason 4clojure
does not like my solution) :
user=> ((fn [[f & r] n]
(if (zero? n)
f
(recur r (dec n))))
'(4 5 6 7 8 9)
6)
nil
user=>
It seems I can't use an explicit anonymous recursive function in the call
position. Is this so? Why? Is it a bug?
Thanks,
Juan Manuel
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